Police say the driver of the truck, whose identity was not released, was driving on Jackson Street near Silva Avenue about 12:15 p.m. when he accidentally pushed down on the gas pedal instead of the brake and struck two pedestrians. After the truck struck the pedestrians, it crashed into a tree in the center island of the roadway, Lt. Bobbie Koller said.

One of the pedestrian suffered serious head injuries and the other suffered possible internal injuries, Koller said.

Both pedestrians, whose age and sex were not released, were transported to a hospital.

The driver of the truck remained at the scene and was cooperating with police.

Anyone with information about the crash is asked to call police at 510-293-7000.